Function isUpper

packages/beth-stack/src/jsx/utils.ts:18–21

(input: string, index: number)

const CAMEL_REGEX = /[a-z][A-Z]/;

export function isUpper(input: string, index: number): boolean {
  const code = input.charCodeAt(index);
  return code >= 65 /* A */ && code <= 90; /* Z */
}

export function isVoidElement(tag: string): boolean {
  // Ordered by most common to least common.